Dipper-tooth point for excavating shovels



June so, 1925 1,544,222

0. CROSBY DIPPER POINT FOR EXGAVA'I'IIG SKOVELS 4 Filed 001;- 22. 1921 4 I F7 6' 5 a I N YEN TOR 9 m /2 0L, VER CR 65y /2 .B i EM *4 J repairs.

I pointed out in the claims.

. cavatin'g shovelis in use.

Patented as. 30, 1925'. i o 2 UNITED PATENT F F'ICE.

onvnn CROSBY, or s'r; PAUL, mmnnso'ra, ASSIGNOR 'ro AMERICAN 3018'! a 15m- 310K 00., or ST. .PAUL, 'mmnnsorm, A rnn'rnnnsnrr. mrrmroorn romr FOR nxcavn'rme SHOVELS. Application filed October 22," 1921. .Serial No. 509,542.

To all whom it may concern: has a beveled or curved top face 5 which Be it known that I, OLIVER GRosBY, a citiwill form a continuation of .the upper zen of the United States, resident of St. curved face 6 of the, shank, and thus the Paul, county of Ramsey, State of Minne forward portion ofthe tooth will slide sota, have invented certain new and useful easily through the earth or soil in gather- Improvements inDipp'er-Tooth Points for ing up the load, and at' itsforward end Excavating Shovels, of which the following one face of the point is slightlyconcave as is a specification. indicated at 7 and will merge into the align- The object of myinvention'is toprovigle 111g face 8' of the shank as illustrated in a dipper tooth po' t adapted to be rigidly Figure 1 of the drawing. One face of the mounted on the en of the toothshank and point is cut-away or recessed as illustrated in Figures" 1 and 2 so as to form an u wardly inclined face 9 onthe opposite si e A further object is to provide a detach- *of the upper rear portion 'of the face 5 asable point-ofnsuch construction and secured Ill r ted 1n Flgures land 2, and extending in such a way that it will-form practically centrally of the inclmed face 9, and longian integral part of the tooth when-the extudmally thereof, is a tongue 10 having a k head,1l with side extensions '12, so as to form- Other objects of the invention will appear a sh p d t ngu {U the IOWGI extremity fr th f ll i d t il d d i ti of this tongue, extending from one s1de of the The invention consists generally in vari-' tooth Q he th there 13 formed 11 Shoulder ous constructions and combinations, all as f Q 'P beldwithe' pg s, h i ft d ib i d ti l ly and at each s1de of the tongue the point 1s formed with a shoulder 14 which 1s made I tho aoo anying d win f i with an upwardly inclined face that termiart of thi ifi atio nates 1n an upright wall 16 that merges mto Figure 1 is a perspective view of the forh mclllled face 9 0f the pp l; 1"-

capable of quick detachment for renewal or ard portion of 3, dipper tooth howing my tion Of the tooth point as illustrated lgure's. 1 and 2. The sides of the T shaped F 2 r 1 8 i fth bi tongue taper'from its lower to its upper end mfigff f fi fi fil th tooth, p and 1ts end isbeveled as at 13, as illustrated F- 3 e t' of the for- Figure lgure 1S a persp c We new The forward end of the shank 2 is reremovable point mounted thereon,

ward end of the tooth, with the point're- Figur 6 s a sl lar iew of th d there is formed .a longitudinall extending 96.

cessed to form an upper downwardly inside of the tooth, showing, somewhat exsocket 20, the confronting wa s of which aggerated, thetaper socket adapted to taper from one end to the other as shown receive the tongue on the point, 8 1n Fl re 6 and are formed w1th. gropves Fi .7 i ti liview on the line or guldeways 21 which serveto receive the; 77 of Figure 5. I y side extensions or ledges 12 of the T shaped o In the drawing the numeral 2 designates tongue' of the removable po nt when the the shankof thedip er'tooth ,formed' with parts are assembled, as illustrated 1n Flgure theusualrecessB to eceive the edge of the 4. Projecting from" thelowg J v end of the dipper'in'the'usual mannerof afii-xing teeth inclined face 18 of the shank at each side thereto. The dipper will be provided with of the socket 20, are lugs 22 which have faces a series of these shanks projecting in front 23 to abut against the upright walls 16 of' thereof'and having points adapted to dig the removable point, and rear,wa rdly and into the earth in filling the excavating dipdownwardly inclined faces '24: to rest upon per. Under the present invention the rethe inclined faces of the shoulders 14, and a movable point, designated by the numeral 4, downwardly extending h9ulder25 to abut m against the shoulder 15 of the removable point when the shank and removable point are assembled as shown in Figural.

It will be observed from the construction described that .the removable point and shank ma bejreadily attached one to the other, an that longitudinal and transverse and vertical stresses are readily taken' u 01 absorbed by the bracing efiect aflorded by one to the other, There are no oppositely diver 'ng wings or arms to either the re.- mova le point or shank and consequently greater stability and stren h andlesslia connection; and the longitudinal axis 'of the the joint formed by the particular construc-. tion affords all possible strength and resist-' so When the locking b0 t further on joint made by the T head and groove connection is not parallel to the wearing line of the point but transversely thereto and ing power without detracting from the easy separation of the 4 arts when necessary. described is removed, the enlargement around the bolt opening affords a bearing to receive the end of an implement to which blows are imparted for separation of the point from the shank which often times is made diflicult by reason of thejoint becoming corroded" when no adequate abutment is provided to receive the blows-for separation of the parts. v

To prevent premature separation of these parts, I prefer to provide asocket 26in the 0 tongue .10 extending vertically through the point, adapted to 'ster with arecess 27 m the'forward portion of the shank.- A. bolt 28 fits into this recess and socket and has a nut 29 within a recess'30 in the underside of the point. v By this means the point of theztooth is made renewable and can be made of very hard material to. resist wearwhen the tooth passes through gravel and rough material. All of the wear on a tooth practically takes plaee-at the 'point and when this point changes shape by wear, the teeth and dipper do. not

satisfactoril "shoveled. Th

penetrate the material-to be e point being hard and easily renewed enables a dipper to be quickly and cheaply repaired without the necessity of removing the main part of the shank ,2, which is riveted or bolted to the front nose of the dipper. The main shank 2 wears slowly. and can be made of a softer material than the point. 7 I claim as my invention:' 1. An excavator dipper-tooth comprising a detachable int' provided with an voverhanging mem r having an up'wardly in.- clined inner face, a substantially T-shaped tongue-projecting fromthe under side of extremity of the tongue extending transversely of the tooth, and shoulders at opposite sldes of the ton ue, each formed with "the inclined face, a shoulder at the loweran inclined seating ace terminating in an v upright wall i'ntersecting the inclined face of the overhanging member; and a shank formed with an inclined face having asubstantially T-shaped lon%' tudinal1y extending socket to. receive the -shaped tongue 0 the point and a transversely extending shoul- -der to bear against the transversely extending shoulder of the point and formed at opposite sides of the socket with forwardlyprojecting 111 1 having inclinedfaces to seat u on the inclined faces of the side shoulders o the point and with end portions to abut the upright walls of said shoulders.

2. An excavator di per tooth comprising a detachable point ormed with a recess extendin throughout a portion of its length to provi e an' 'overhangmg member havmg an upwardly inclined inner face and a bev- Ieledterminal edge, a substantiall T shaped tongue pro'ecting from the un er side of the inchne the to e extendin from side to side of the too and shou ders at op ositesides of theto e, at its base,-each ormed with an inclin seating face terminating in an e overhangin member; and a shank formed with an inc ined face terminating in a beveled recess to receive the beveled edfie of the point and formed'with a substantia y .T shaped longitudinally extending socket to receive the tongue ofthe point, the shank being provided with projecting end lugs at opposite sides'of the socket formed with u right end'faces to bear againstthe upright walls of the side shoulders of the point and with inclined faces to seat on the inclined faces of the said shoulders and having a transversely extending shoulder to fit ainst the transversely extending shoulder o the point. g

In 'witness whereof, I have hereunto setmy hand this 19th day of October, 1921.

LIVER CROSBY face, a shoulder at the base of u right wall intersecting the inclin'ed' face 

